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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
8. EGSM Transmitter
U100 Pin#6
About 2~3 dBm?
YES
U102, CON101
Check & Change
C103
= 3.7V?
YES
Level of
U101 Pin #6 is
1.2V?
YES
YES
U101 pin#7
About -5 dBm?
NO
U101 pin#3
High ?
YES
Change U101
U103 Check
Pin#9,32 ≥ 2.8V ?
U103 Check
Pin #8 : 13MHz ?
Vpp : 860mV?
NO
U401 Pin
#4,5,6,7 = 1.7V?
Change U101
Check U200
NO
U100
Pin#10 = High?
YES
NO
Level of
U100 Pin#7 is
4~5dBm ?
YES
U100
Check & Change
NO
Check the
Battery Block
NO
Check
& Change R107
OK ?
YES
NO
Check U200
NO
YES
NO
Pin #8 : 13MHz ?
YES
YES
SAM SU N G Pr opr i et ar y- C ont ent s m ay change w i t hout not i ce
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NO
U200, Q202
Check & Change
Continuous TX ON condition
TX Power Code : 500 code Applied
NO
Check & Change
U300, C306, C308
Check or resolder
NO
OSC100 Check
Vpp : 950mV?
YES
R114, C129
resolder
2-8
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
U200
NO
OSC100 Check
Pin #4 = 2.8V ?
YES
OSC100
Change or resolder
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